CODEWITHSUNDEEP
pythonopenglfreeglut
Tri Angular
Tri Angular

Reputation: 27

PyOpenGL Lighting Color Format Issue

I am attempting to make a 3D rotating torus with lighting. The rotating torus works fine. The lighting is the problem; if I leave GL_SPECULAR to its default, the light works fine. When I try to set it to a RGBA float quadruplet (what it is supposed to be) it says it is the incorrect format. I tried to print the actual default value of GL_SPECULAR using print(str(int(GL_SPECULAR))) it returns the float 4611.0, and I can not find any information on this type of color format. Here is my code:

from OpenGL.GLU import *
from OpenGL.GL import *

glutInit()

GL_SPECULAR=(0.0,0.0,1.0,1.0)

def display():
    glClearColor(1,1,1,1)
    glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT)
    glEnable(GL_LIGHTING)
    glEnable(GL_LIGHT1)
    glEnable(GL_DEPTH_TEST)
    glLight(GL_LIGHT1,GL_SPECULAR,GL_POSITION)
    glutSolidTorus(0.3,0.5,10,10)
    glRotatef(1,1,1,0)
    glutSwapBuffers()
    glutPostRedisplay()

def main():
    glutInitDisplayMode(GLUT_DOUBLE|GLUT_RGBA)
    glutCreateWindow('window')
    glutDisplayFunc(display)
    glutMainLoop()

if __name__=='__main__':
    main()

Error:

Traceback (most recent call last):
  File "C:\Users\trian\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.9_qbz5n2kfra8p0\LocalCache\local-packages\Python39\site-packages\OpenGL\GLUT\special.py", line 130, in safeCall
    return function( *args, **named )
  File "c:\Users\trian\python\glut.py", line 15, in display
    glLight(GL_LIGHT1,GL_SPECULAR,GL_POSITION)
  File "src\latebind.pyx", line 39, in OpenGL_accelerate.latebind.LateBind.__call__
  File "src\wrapper.pyx", line 314, in OpenGL_accelerate.wrapper.Wrapper.__call__
  File "src\wrapper.pyx", line 311, in OpenGL_accelerate.wrapper.Wrapper.__call__
  File "C:\Users\trian\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.9_qbz5n2kfra8p0\LocalCache\local-packages\Python39\site-packages\OpenGL\platform\baseplatform.py", line 415, in __call__
    return self( *args, **named )
ctypes.ArgumentError: ("argument 2: <class 'TypeError'>: wrong type", (GL_LIGHT1, (0.0, 0.0, 1.0, 1.0), c_float(4611.0)))
GLUT Display callback <function display at 0x000001EBCB08E820> with (),{} failed: returning None ("argument 2: <class 'TypeError'>: wrong type", (GL_LIGHT1, (0.0, 0.0, 1.0, 1.0), c_float(4611.0)))
PS C:\Users\trian\python>

Upvotes: 1

Views: 275

Answers (1)

Rabbid76
Rabbid76

Reputation: 210938

When lighting (GL_LIGHTING) is enabled, then the color which is associated, is taken from the material parameters (glMaterial).

If you still want to use the current color attribute (which is set by glColor), then you have to enable GL_COLOR_MATERIAL and to set the color material paramters (glColorMaterial):

glEnable(GL_COLOR_MATERIAL)
glColorMaterial(GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE)

See also Basic OpenGL Lighting.

The instruction glLight(GL_LIGHT1,GL_SPECULAR,GL_POSITION) doesn't make any sense at all. Read glLight. e.g.:

glLightfv(GL_LIGHT1, GL_POSITION, [0, 100, 0, 0])
glLightfv(GL_LIGHT1, GL_DIFFUSE, [1, 0, 0, 1]) # red

Upvotes: 1

Related Questions